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afcf3cd8eb
Implement an internal version of __access called __access_noerrno that avoids setting errno. This is useful to check accessibility of files very early on in process startup i.e. before TLS setup. This allows tunables to replace MALLOC_CHECK_ safely (i.e. check existence of /etc/suid-debug to enable/disable MALLOC_CHECK) and at the same time initialize very early so that it can override IFUNCs. Checked on x86_64. * hurd/hurd.h (__hurd_fail_noerrno): New function. * include/unistd.h [IS_IN (rtld) || !defined SHARED]: Declare __access_noerrno. * io/access.c (__access_noerrno): New function. * sysdeps/mach/hurd/access.c (hurd_fail_seterrno): New function. (hurd_fail_seterrno): Likewise. (access_common): Likewise. (__access_noerrno): Likewise. * sysdeps/nacl/access.c (__access_noerrno): Likewise. * sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise. * sysdeps/nacl/nacl-interfaces.h (NACL_CALL_NOERRNO): New macro.
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* Linux implementation for access function.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <fcntl.h>
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#include <unistd.h>
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#include <sysdep-cancel.h>
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int
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__access_noerrno (const char *file, int type)
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{
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int res;
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INTERNAL_SYSCALL_DECL (err);
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#ifdef __NR_access
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res = INTERNAL_SYSCALL_CALL (access, err, file, type);
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#else
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res = INTERNAL_SYSCALL_CALL (faccessat, err, AT_FDCWD, file, type);
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#endif
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if (INTERNAL_SYSCALL_ERROR_P (res, err))
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return INTERNAL_SYSCALL_ERRNO (res, err);
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return 0;
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}
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int
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__access (const char *file, int type)
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{
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#ifdef __NR_access
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return INLINE_SYSCALL_CALL (access, file, type);
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#else
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return INLINE_SYSCALL_CALL (faccessat, AT_FDCWD, file, type);
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#endif
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}
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weak_alias (__access, access)
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